/*
 * OREKIT-X
 * Copyright 2002-2008 CS Communication & Systemes
 * 
 * Parts of this software package have been licensed to CS
 * Communication & Systemes (CS) under one or more contributor license
 * agreements.  See the NOTICE file distributed with this work for
 * additional information.
 *  
 * This is an experimental copy of OREKIT from www.orekit.org.
 * Please use the original OREKIT from orekit.org for normal work
 * unrelated to this research project.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you
 * may not use this file except in compliance with the License.  You
 * may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied.  See the License for the specific language governing
 * permissions and limitations under the License.
 */
package ore.time.date;

/** 
 * Class providing the months sequence for common years.
 * 
 * @author Luc Maisonobe
 */
public final class CommonYearFactory
    extends Object
    implements MonthDayFactory
{
    public final static MonthDayFactory Instance = new CommonYearFactory();

    /** 
     * Months succession definition.
     */
    private static final int[] PREVIOUS_MONTH_END_DAY = {
        0, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
    };


    public CommonYearFactory(){
        super();
    }


    public int getMonth(int dayInYear) {
        return (dayInYear < 32) ? 1 : (10 * dayInYear + 323) / 306;
    }
    public int getDay(int dayInYear, int month) {
        return dayInYear - PREVIOUS_MONTH_END_DAY[month];
    }
    public int getDayInYear(int month, int day) {
        return day + PREVIOUS_MONTH_END_DAY[month];
    }
}
